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B. SEPTIC TANK: <br /> The septic tank shall have a minimum liquid capacity of 1,200 gallons. <br /> 1. PURPOSE: <br /> The septic tank retains raw sewage and separates the solids from the liquids by <br /> sedimentation and liquefaction through bacterial action. The larger the tank, the <br /> longer the retention and the clearer the liquid (effluent). This permits a relatively clear <br /> liquid to flow into the subsurface disposal fields. <br /> 2. MATERIALS: CCU) M&1,�aefb 7z? k3 /, "M dG Cunz-r-w* <br /> The following materials may be used for construction of the septic tank: <br /> a. Approved precast concrete. <br /> b. Approved poured, reinforced concrete. <br /> c. Other approved materials. <br /> 3. DESIGN: <br /> This bulletin shows an approved design for a 1,200-gallon septic tank. <br /> a. The septic tank shall have two compartments. The first, or inlet compartment, shall <br /> contain at least 2/3 of the total tank capacity. <br /> 4. SEPARATION: <br /> A five-foot(5') A.B.S. schedule 40 or SDR-35 tightline with continuous soil barrier shall <br /> be installed between the septic tank and the leach line or distribution box. If more than <br /> one hundred feet (100') between septic tank and D-Box, two-way clean out is required. <br /> C. DISTRIBUTION BOX: <br /> 1. PURPOSE: <br /> The distribution box distributes the liquid from the septic tank equally among two or <br /> more lines of the leaching field. The distribution box also provides an inspection point <br /> and may be used to control the flow of the effluent to the leaching field. <br /> a. Inlets and outlets of any distribution box shall be watertight. A five-foot(5) <br /> minimum A.B.S. Schedule 40 or SDR-35 tightline with continuous soil barrier shall <br /> be installed between the distribution box and the leach line. <br /> D. SU SURFACE DISPOSAL FIELD p <br /> 1. LEACH LINES: �E T7efewll ON I/�EVI'5t� '11Te ` «I4j <br /> a. PURPOSE: '4',j> ^-iee <br /> Leach lines provide additional treatment and disposal for sewage. <br /> EHD 42-013 Page 4 RESIDENTIAL ONSITE SYSTEMS BULLETIN <br /> 9/3/08 <br />